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Homework Help: Number of repeating variable

  1. Jun 19, 2016 #1
    1. The problem statement, all variables and given/known data

    Is the question wrong ?

    2. Relevant equations

    3. The attempt at a solution
    I found that the number of dimension = 6 , primary dimensionof velocity is L / T , which is 2 , number of repeating variable = 2 , so , there are 6-2 = 4 pi group , why the question only gt 3 pi group ?
    Last edited: Jun 19, 2016
  2. jcsd
  3. Jun 19, 2016 #2
    How to do this question?
  4. Jun 19, 2016 #3


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    Science Advisor
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    Gold Member

    Not sure where you get that formula from. As I understand it, you have 6 quantities that, between them, involve 3 dimensions (MLT), so the equation can be written relating 6-3=3 dimensionless expressions.
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